Headboard



FIG. 1 is a left front perspective view of a headboard showing my new design;

FIG. 2 is a front elevational view thereof; and

FIG. 3 is a top view thereof; and,

FIG. 4 is a side view, the opposite side being a mirror image of the side shown.

The bottom and rear views are not shown and form no part of the claimed design. The dotted lines represent environmental elements only and form no part of the claimed design. 

The ornamental design for headboard, as shown and described. 